Error running Auto-Attach in the Sat6 GUI for some hosts "An error occurred trying to auto-attach subscription. Please check your logs for further information."

Issue

• For some hosts when I run a "run Auto-Attach" in the Satellite 6 GUI in the content host page, I'm getting an (generic) error:

  An error occurred trying to auto-attach subscriptions. Please check your log for further information.

• After this error no more subscription information nor event information will be visible in the GUI.

• On the local cmdline of the concerning Linux server using subscription-manager you will get information.

  # subscription-manager list --consumed
  +-------------------------------------------+
     Consumed Subscriptions
  +-------------------------------------------+
  ... 
  ...
  Subscription Name:   Red Hat Enterprise Linux for Virtual Datacenters with Smart Management, Premium (DERIVED SKU)
  Provides:            Red Hat Beta
                       Red Hat EUCJP Support (for RHEL Server) - Extended Update Support
  ... 
  SKU:                 RH00051
  Contract:            10113471
  Account:             1054418
  Serial:              8956302808035775631
  Pool ID:             8a7be4de58632b2301586394297703a7
  Provides Management: Yes
  Active:              True
  Quantity Used:       1
  Service Level:       Premium
  Service Type:        L1-L3
  Status Details:      Subscription is current
  Subscription Type:
  Starts:              05/22/2016
  Ends:                05/22/2017
  System Type:         Virtual
  ...
  ...
  

• But subscription management via the Satellite 6 GUI is not possible anymore..

• Also in the Satellite view, this server reports a Subscription Status of Unentitled, while the cmdlne is telling us differently.

• I suspect that this behavior started after the upgrade to another version of virt-who, but I don't know for sure. Also it looks like for new hosts the auto-attach goes OK.